Lifting-jack.



` E. ERICKSON a. P. smsTRoM.

LIFTING JACK.'

I lAPPLICATION FILED APR. 4, 1914. 19199263- Patented May 1l, 1915.

r ee@ 'l :H l|| |f| I1k l :gl I 43 P:

nil I l Il :s:l MI

Ill H: Z0 :E: 1H. g 1' 27 Z4 f' i /9 j i z3 36 /8 i @D 37 32 533K f 34 wwwegg@ Z 3 lwen'lo' .Edward Ercns-@Pz EDWARD ERICKSON' AND PETER SJGSTROM, 0F MALDEN,I1IAIAVSSACHUSETTIS.

LIFTING-J'ACK.

Specification of Letters Patent.

Patented May 11, 1915.

- Application led April 4, 1914. Serial No. 829,562.

T0 all 'whom t may concern.'

Be it known thatwe, EDWARD ERICK- soN and PETER SJos'rRoM7 subjects of the Czar of Russia andKing of Sweden, respectively, residents of Malden, in the county of Middlesex and State of Massachusetts, have invented certain vnew and useful Improvements in Lifting-Jacks, of which the following is a specification.

This invention relates to tools or appliances of the type commonly known as hydraulic jacks, although the particular vdevice herein illustrated and described is intended usually to employ oil as the Huid which is pumped into the chamber to effect the lifting operation.

A particular object of our present invention is to provide an improved device of character adapted for use with automo A further object is to provide means whereby the jack can be operated without requiring the manipulator to get under the car. s .l

With these and further objects in view,` the invention consists in the construction and combination of parts substantially as hereinafter described and claimed.l

Of the accompanying drawings z-Figure 1 is an elevation, partly in section, of a Jack embodying our present improvements, said figure being broken out to reduce the height of the illustration; Figs, 2 and 3 represent sections on lines 2-2 and 3-3 respectively of Fig. 1.

Similar reference characters indicate similar parts in all of the views.

A suitably shaped base 10 supports the upright jack cylinder 11 in which is located the lifting piston rod 12, the upper end of which is provided with a head 13 to engage the member or the portion of a car which isto be elevated. Preferably the head. 13 is rotatably mounted, such as by means of a screw, indicated by dottedvlines in Fig. 1, so that said head may be turned to properly engage an axle and still enable the operating pump, hereinafter described, to extend in any direction either toward vthel front or rear`of the car or out between the spokes of a wheel. The lower end ofthe rod y12.11515 a. suitable iston 14.

Rotate ly mounted in a transversb apertu're in the base, is a tapered plug 15, said plug being illustrated as having a screw threaded stem 16 at one end on which is mounted a washer 17, one o r more nuts 18 being employed to hold the plug 15 liquidtight in its seat. The other end of the plug is fformed or provided with a head 19 having a recess in whichni's threaded or otherwise secured the lower end of the barrel 2O of the pump member of the jack, said cylinder having a cap 21 and a suitable gland or packing 22 at the upper end.

An `inner tubular member 23 is rigidl)7 connected at its lower end to the plug 15, said tube forming a guide as hereinafter described. Within the tube 23 is slidably mounted the pump piston 24 having a handle 25 secured to its upper end. Also secured to said handle or to the rod 24 is a tube 2 6, having a diameter sufficient to .snugly embrace the tubular guide 23, the

latter of course also guidingthe piston 24. The co-action of the tubes 23 and 26 is such as to very materially strengthen the piston 24 to avoid bending of the latter during its down stroke. vantage where the piston is, as in this case,

, quite slender.

Surrounding the sliding tube^26 1s an annular chamber for the oil or other liquid employed.

Extending longitudinally of the plug 15 is a port 28, the inner end of which communicates by means of a transverse port, with a chamber 29 (Figs. 1 and 2), the bottom of said chamber being formed as a seat for a valve, such as the ball valve 30. A stop pin 31 is suitably located to prevent the ball valve from shifting too faraway from its seat. -The other end of they port 28 communicates with a chamber 32 in which is located a valve 33, a st )p pin 32, being provided to prevent the valve from shifting too far away from its seat. For-convenience of manufacture the valve seat is preferably formed at the inner end of a screw plug 35.

A transverse port 36 connects the lowerl This is of substantial ad- Cates at the bottom by means of a port 39 with the chamber 29, a port 40 being also holder may consist of a band,43 secured in any suitable manner to the upper portion of the cylinder 1l and extending laterally and having spring branches to receive a side portion of the cylinder. 20, one of the branchesbeing indicated in Fig. l by dotted lines as extending partially behind the barrel 20, the front branch not appearing.

The operation of the device or implement is as follows Liquid, preferably lubricating oil, being placed inthe annular chamber 27, the device is ready for use by placing it so that the head 13 of the lifting rod 12 will be located under the axle of an automobile or anything else that is to be lifted. The width of the chamber 29 (Fig. 2) circumferentially is such as to permit considerable latitude of swinging movement of the barrel 2O without interruptingA the communication of said chamber, 29 with the port 39. We do not limit ourselves, however, to the width indicated in Fig. 2. The width, however, should not be such that there will be communication with the port 39 when. the barrel 20 is turned in the direction of the arrow Fig. 2, down to a horizontal position. Preferably the plug and its chamber and ports is so constructed that when the barrel 20 is in horizontal position a portion of the periphery of the plug 15 will cutof the port 39 for a reason .presently de.- scribed. rIhe width of such chamber 29 is,

however, such that the pump can be op erated when it is inclined considerably away from vertical position, so that the handle 25 can be operated without the user having to get under the car. In other words the construction is such that the device can be operated with the pump inclined so far away from the vertical, that the user can remain at the rear or front of the car, according to which axle is to be lifted, or the handle may be operated between the spokes of a wheel of the car. When the handleV is withdrawn, the rod 24 sucks liquid through port 36, chamber 32, through port 37 and cham:

- ber 38 past the valve 33, the liquid being drawn from theannular chamber 27. Upon the return movement the plunger 24 forces the liquid through ports 36, 28, past the ball valve 30, and through .chamber 29 and port 3 9 into the chamber below the piston 14, thereby causing a lifting action in a manner well understood. Successive operations aisance will eEect a lifting to any desired extent within the limits of the size of the jack.

When it is desired to lower the operative portion of the jack, all that is necessary is to lay the barrel 20 down to substantially horizontal position', this rotating the plug 15 in the direction of the arrow Fig. 2, the port 42 then registering with the port 40, so that the liquid below the piston 14 will flow throughl the po'rts just described and the port 41 back into the .annular chamber 27.

It will now be understood that the device as a whole comprises two members each of which includes a cylinder and a piston. These two members have but a single pivotal connection which furnish communication between the two cylinders. Therefore,I the device may be operated as hereinbefore described with the two members'at varying angles relatively to each other, there being of the barrel 20 without interrupting the communication of the chamber 29 with the port 39. This enables the userto operate the device without having to get under the car.

What we claim is:

1. A device of the character described, comprising. two members each' including a cylinder and a piston, said members having a single pivotal connection having valved ports. to permit the device to be operated with the two members at varying angles relatively to each other, all of the ports which furnish communication between the two cylinders being provided in said single pivotal` connection.

2. A device of the character described,

comprising two members each including a cylinder and a piston, said members having a freey pivotal connection to permit the device to be operated with the two members at varying angles relatively to each other, the pivotal connection having valved ports providing communication betweenthe two cylinders, means being provided for holding the two members substantially parallel when not in use. h

3..A liquid-operated lifting-jack comprising a base having an upright cylinder, a piston and lifting rod in said cylinder, a plug rotatably mounted adjacent the lower end of said cylinder, and a pump connected solely with the plug whereby it may be swung to either one of a plurality of positions relatively to the base and upright cylinder and operated in such position, said plug having valved passageways for controlling the communication between said cylinder and pump.

4. A liquid-operated lifting-jack comprising a base having an upright cylinder,

85 considerable latitude of swinging movement tapered plug rotatably mounted adjacent the lower'end of said cylinder, a pump connected with the plug, 'said plug having passageways for controlling the communica'- tion between said cylinder and pump, and valves for controlling said passageways.

5. A liquid-operatedl lifting-jack comprising a base having an upright cylinder, a

piston and lifting rod in said cylinder, a plug rotatably mounted adjacent the lower end of said cylinder, and a pumpl connected with the plug, said plug having ports adapted to permit the How of liquid from the,

pump into the cylinder when the plug is in one rotative position and to permit liquid to return to the pump from the .cylinder when in another rotative position.

6. A device of the character described comprising two members pivotally Aconnected, each of said members including a cylinder and a piston, the pivotal connection having valved ports, one of said ports being wide circumferentially, the'pivotal connec- 1 tion being free, to permit the device to be operated with the two members at varying angles relatively to each other.

7. A device of the. character described .Comprising a base having a cylindeigfa pistonand lifting rod in said cylinder, a plug rotatably mounted in said base, and a pump connected with said plug for operating said piston, said plug having valved passageways, one of the passa-geways in the plug being wide circumferentially to permit passage of liquid when the plug is in either one of severalpositions of rotative adjustment. V

In testimony whereof we have ailixed our' signatures,1in presence of two witnesses.

' EDWARD ERICKSON.

PETER SJ OSTROM. Witnesses:

A. W. HARRISON,

A. F. RANDALL. 

